SYSTEMS OPERATION - Continued
MANIFOLD HEATER. Manifold heater fuel system uses plastic and steel tubing to supply fuel
from the primer pump pressure fuel line through the manifold heater fuel filter and manifold
fuel heater solenoid valve to manifold heater nozzles.
Excess fuel from nozzles is returned
through intake manifold air heater solenoid valve to engine fuel return system.
mounted on intake manifolds use a spark plug to ignite and burn pressurized engine fuel to
provide heated air for cold weather starting.